A Trusted Third Party (TTP) is an entity that acts as an intermediary in transactions or communications between two or more parties. The role of the TTP is to facilitate trust between those parties, ensuring that the interactions are secure, confidential, and reliable. TTPs are commonly used in various contexts, particularly in areas such as finance, legal agreements, and digital communications, where establishing trust is crucial.
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A participant whose correct behaviour and protection of secret state are assumptions of a security argument. It can mediate authentication and session key transport, but the protocol still needs to authenticate its responses.